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666678889 = 13914333347
BaseRepresentation
bin100111101111001…
…011011001101001
31201110110210111201
4213233023121221
52331132211024
6150053124201
722343451142
oct4757133151
91643423451
10666678889
11312360798
12167329661
13a8173866
1464782ac9
153d7de744
hex27bcb669

666678889 has 8 divisors (see below), whose sum is σ = 672144480. Its totient is φ = 661223136.

The previous prime is 666678871. The next prime is 666678899. The reversal of 666678889 is 988876666.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2k-666678889 is a prime.

It is a Duffinian number.

It is a plaindrome in base 10.

It is a self number, because there is not a number n which added to its sum of digits gives 666678889.

It is not an unprimeable number, because it can be changed into a prime (666678899) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 197514 + ... + 200860.

It is an arithmetic number, because the mean of its divisors is an integer number (84018060).

Almost surely, 2666678889 is an apocalyptic number.

It is an amenable number.

666678889 is a deficient number, since it is larger than the sum of its proper divisors (5465591).

666678889 is a wasteful number, since it uses less digits than its factorization.

666678889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4919.

The product of its digits is 41803776, while the sum is 64.

The square root of 666678889 is about 25820.1256580986. The cubic root of 666678889 is about 873.5858032995.

The spelling of 666678889 in words is "six hundred sixty-six million, six hundred seventy-eight thousand, eight hundred eighty-nine".

Divisors: 1 139 1433 3347 199187 465233 4796251 666678889